#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>

size_t my_strlen(char* str) 
{
    int i = 0;
    while (*str++) 
    {
        i++;
    }
    return i;
}

int main() {
    char str[] = "Hello, World!";
    printf("The length of the string is: %d\n", my_strlen(str));
    return 0;
}